no matter what some have said this is going to be the best version of megatron that turns into a gun IMO, but it looks like how they make the head fit the same space as it did on the original (also IMO)

I'm not sure it's a G1-style face considering you cant see his eyes at all. It's just to show how that section transforms because it's different from the original toy, cause the old helmet of the Megatron toy was just the back of the gun, it's the same transformation scheme essentially so it had to be there again.